我正在使用SQlite3在Xcode 4.3中处理iPhone项目，SQlite和Xcode之间的连接完成，现在我想将我的数据显示到表视图（三个视图）中，并且只读！ 所以我有主表视图，选择raw - ＆gt;进入第二个视图并加载来自DB select raw的其他数据 - ＆gt;进入详细信息视图以显示长文本和图像！
任何帮助表示感谢。
AppDelegate.h
#import "AppDelegate.h"
#import "MasterViewController.h"
@implementation AppDelegate
@synthesize window = _window;
@synthesize navigationController = _navigationController;
- (void)dealloc
{
[_window release];
[_navigationController release];
[super dealloc];
}
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];
// Override point for customization after application launch.
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDir = [paths objectAtIndex:0];
NSString *dbPath = [documentsDir stringByAppendingPathComponent:@"cities.sqlite"];
NSFileManager *fileManager = [NSFileManager defaultManager];
BOOL success = [fileManager fileExistsAtPath:dbPath];
if (success) {
NSLog(@"we have the database");
} else {
NSLog(@"we have no database");
NSString *defaultDBPath = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"cities.sqlite"];
BOOL moved = [fileManager copyItemAtPath:defaultDBPath toPath:dbPath error:nil];
if (moved) {
NSLog(@"database copied");
}
}
MasterViewController *masterViewController = [[[MasterViewController alloc] initWithNibName:@"MasterViewController" bundle:nil] autorelease];
self.navigationController = [[[UINavigationController alloc] initWithRootViewController:masterViewController] autorelease];
self.window.rootViewController = self.navigationController;
[self.window makeKeyAndVisible];
return YES;
}
MasterViewController.h
#import <UIKit/UIKit.h>
#import <sqlite3.h>
@class DetailViewController;
@interface MasterViewController : UITableViewController {
NSMutableArray *cities;
}
@property (strong, nonatomic) DetailViewController *detailViewController;
@end
MasterViewController.m
- (void)viewDidLoad
{
[super viewDidLoad];
students = [[NSMutableArray alloc] init];
countries = [[NSMutableArray alloc] init];
// Do any additional setup after loading the view, typically from a nib.
self.navigationItem.leftBarButtonItem = self.editButtonItem;
UIBarButtonItem *addButton = [[[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemAdd target:self action:@selector(insertNewObject:)] autorelease];
self.navigationItem.rightBarButtonItem = addButton;
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDir = [paths objectAtIndex:0];
NSString *dbPath = [documentsDir stringByAppendingPathComponent:@"cities.sqlite"];
sqlite3 *database;
if (sqlite3_open([dbPath UTF8String], &database) == SQLITE_OK) {
const char *sqlStatement = "select * from cities_info";
sqlite3_stmt *compileStatement;
if (sqlite3_prepare_v2(database, sqlStatement, -1, &compileStatement, NULL) == SQLITE_OK) {
while (sqlite3_step(compileStatement) == SQLITE_ROW) {
NSLog(@"one record");
NSString *cityName = [NSString stringWithUTF8String:(char *)sqlite3_column_text(compileStatement, 1)];
[cities addObject:cityName];
}
NSLog(@"cities: %@",cities);
}
} else {
NSLog(@"error in database");
}
}
块引用
答案 0 :(得分：2)
我建议使用SQLite的轻量级包装器 - 请参阅https://github.com/JohnGoodstadt/EasySQLite
这将允许：
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return _personTable.rows.count;
}
和
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
...
NSArray* row= _personTable.rows[indexPath.row];
cell.textLabel.text = row[[_personTable colIndex:@"lastname"]];
...
使用代表SQL表的iVar进行设置：
self.personTable = [_db ExecuteQuery:@"SELECT firstname , lastname , age , salary FROM person"];
数据库连接iVar传入您的SQL文件名：
self.db = [DBController sharedDatabaseController:@"DataTable.sqlite"];
答案 1 :(得分：0)
首先，我建议使用FMDB，这是围绕sqlite3的Objective-C包装器。其次，我将创建一个带有共享实例的自定义数据访问对象，如下所示：
@interface MyDatabaseDAO : NSObject
@property (nonatomic, strong) FMDatabase *database;
@end
@implementation MyDatabaseDAO
@synthesize database = _database;
+ (MyDatabaseDAO *)instance {
static MyDatabaseDAO *_instance = nil;
@synchronized (self) {
if (_instance == nil) {
_instance = [[self alloc] init];
}
}
return _instance;
}
- (id)init {
self.database = [FMDatabase databaseWithPath:myDatabasePath];
[self.database open];
}
- (void)dealloc {
[self.database close];
}
@end
此DAO必须具有3种访问方法：一种用于数据库中的每个数据对象。因为你不具体，我制作了这些没有任何特定属性的对象。
- (NSArray *)retrieveAllFirstViewItems {
NSMutableArray *items = [NSMutableArray array];
FMResultSet *resultSet = [FMDBDatabase.database executeQuery:@"SELECT * FROM myFirstViewItemTable"];
while ([resultSet next]) {
// extract whatever data you want from the resultset
NSString *name = [resultSet stringForColumn:@"name"]
[items addObject:name];
}
[resultSet close];
return items;
}
- (MySecondViewItem *)retrieveSecondViewItemFromIndexPath:(NSIndexPath *)indexPath {
FMResultSet *resultSet = [FMDBDatabase.database executeQuery:@"SELECT * FROM mySecondViewItemTable WHERE pid = ?", [indexPath indexAtPosition:0]];
if ([resultSet next]) {
// extract whatever data you want from the resultset
NSString *name = [resultSet stringForColumn:@"name"]
MySecondViewItem *mySecondViewItem = [[MySecondViewItem alloc]
initWithName:name withPID:[indexPath indexAtPosition:0]];
[resultSet close];
return mySecondViewItem;
} else {
return nil;
}
}
- (MyThirdViewItem *)retrieveThirdViewItemFromIndexPath:(NSIndexPath *)indexPath {
FMResultSet *resultSet = [FMDBDatabase.database executeQuery:@"SELECT * FROM mySecondViewItemTable WHERE pid = ?", [indexPath indexAtPosition:1]];
if ([resultSet next]) {
// extract whatever data you want from the resultset
NSString *name = [resultSet stringForColumn:@"name"]
MyThirdViewItem *myThirdViewItem = [[MyThirdViewItem alloc]
initWithName:name withPID:[indexPath indexAtPosition:1]];
[resultSet close];
return myThirdViewItem;
} else {
return nil;
}
}
由于它是只读的，因此这些都是必需的方法。在您的第一个UITableView中，只需实现方法：
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
MySecondViewItem *mySecondViewItem = [[MyDatabaseDAO instance] retrieveSecondViewItemFromIndexPath:indexPath];
//instantiate a view from this item and use [UINavigationController pushViewController:animated:] to navigate to it
}
剩下的只是以某种方式在视图中显示您的数据对象。我建议在数据访问对象中尽可能多地进行数据检索，以便视图控制器可以读取数据对象的属性，而不必担心后端。
这就是它的全部！我希望这有帮助